Book Image

Extending SaltStack

Book Image

Extending SaltStack

Overview of this book

Salt already ships with a very powerful set of tools, but that doesn't mean that they all suit your needs perfectly. By adding your own modules and enhancing existing ones, you can bring the functionality that you need to increase your productivity. Extending SaltStack follows a tutorial-based approach to explain different types of modules, from fundamentals to complete and full-functioning modules. Starting with the Loader system that drives Salt, this book will guide you through the most common types of modules. First you will learn how to write execution modules. Then you will extend the configuration using the grain, pillar, and SDB modules. Next up will be state modules and then the renderers that can be used with them. This will be followed with returner and output modules, which increase your options to manage return data. After that, there will be modules for external file servers, clouds, beacons, and finally external authentication and wheel modules to manage the master. With this guide in hand, you will be prepared to create, troubleshoot, and manage the most common types of Salt modules and take your infrastructure to new heights!
Table of Contents (21 chapters)
Extending SaltStack
About the Author
About the Reviewer

Building a templating renderer

Building a renderer that handles templating files is not that different from one that does serialization. In fact, the renderer itself is pretty much the same, outside of the library-specific code. This time, we'll use a Python library called tenjin. You may need to install it using pip:

# pip install tenjin

Templating with Tenjin

This module makes use of a third-party library, so there will be a __virtual__() function to make sure it's installed:

Conver a file using the Tenjin templating engine

This file should be saved as salt/renderers/
from __future__ import absolute_import
    import tenjin
    from tenjin.helpers import *
    HAS_LIBS = True
except ImportError:
    HAS_LIBS = False
from salt.ext.six import string_types

def __virtual__():
    Only load if Tenjin is installed
    return HAS_LIBS

def render(tenjin_data, saltenv='base', sls='', **kwargs):
    Accepts a tenjin, and renders said data back to...